Steric stabilization of a cellulose microcrystal suspension by poly(ethylene glycol) grafting

被引:553
作者
Araki, J [1 ]
Wada, M [1 ]
Kuga, S [1 ]
机构
[1] Univ Tokyo, Grad Sch Agr & Life Sci, Dept Biomat Sci, Bunkyo Ku, Tokyo 1138657, Japan
关键词
D O I
10.1021/la001070m
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A sterically stabilized aqueous suspension of rodlike cellulose microcrystals was prepared by the combination of acid hydrolysis of native cellulose, oxidative carboxylation of microcrystals, and grafting of poly(ethylene glycol) having a terminal amino group on one end (PEG-NH2, MW = 1000) using water-soluble carbodiimide. Chemical binding of PEG to the microcrystals was confirmed by weight increase, diminishment of carboxyl groups, thermogravimetry, and infrared spectroscopy, resulting in consumption of 20-30% of the initially introduced carboxyl groups. The amount of bound PEG was 0.2-0.3 g/g of cellulose. The PEG-grafted cellulose microcrystals showed drastically enhanced dispersion stability, that is, resistance to addition of 2 M sodium chloride, and ability to redisperse into either water or chloroform from the freeze-dried state. The concentrated aqueous suspension of PEG-grafted microcrystals formed a chiral nematic mesophase through a phase separation similar to that of the ungrafted sample, but with a reduced spacing of the fingerprint pattern.
引用
收藏
页码:21 / 27
页数:7
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